Mini For BF is a lightweight and powerful unofficial Facebook client aimed mainly at users who want to use Facebook on their Android, but find that the official app uses too many resources and takes up too much space.
With Mini For BF, you can do exactly the same things as with the official app. Plus, you have a slide-out menu on the left where you can quickly access your different news feeds. Another interesting feature is that you can use Facebook Messenger directly within the app, without having to download the separate app.
Mini For BF is a great Facebook client that may not offer an especially attractive or convenient interface, but it does let you use Facebook on less powerful devices. In short, if you have problems running the official Facebook app, this is a great alternative for you to try.